Hello Doug,
Special Menu is designed full on Home Page only when there is Feature Section Enable like the demo .
Please follow the documentation,
1. Select Home page and Post page ( https://doc.acmethemes.com/online-shop-pro/#StaticFrontPage(HomepageSetting) )
2. From Appearance => Customize, add Feature Section and Setting
If you want to enable Special Menu on Inner pages like you want it needs customization of the theme.
Best Regards!